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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net lease right-of-use assets recognized upon adoption of Topic 842	$ 538
Lease liabilities recognized upon adoption of Topic 842	$ 507
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net lease right-of-use assets recognized upon adoption of Topic 842		$ 560
Lease liabilities recognized upon adoption of Topic 842		$ 570

X

- Definition

Leases, Liability

+ References

No definition available.

+ Details

Name:	paa_LeasesLiability
Namespace Prefix:	paa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Leases, Right-Of-Use Asset

+ References

No definition available.

+ Details

Name:	paa_LeasesRightOfUseAsset
Namespace Prefix:	paa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201602Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: